Shaft modification or manufactured new one

Shaft modification or manufactured new one

Shaft modification or manufactured new one

I am dealing with a problem with a shaft, the story is, I have a shaft to replace a damaged shaft in a system but this is shorter by 300 mm that I am requiring, my question is Can I add a piece of 300 mm to the shaft(welded or mech. coupling), to complete the total required length or This could be a little dangerous and it is necessary to manufacture a new shaft.

RE: Shaft modification or manufactured new one

At that low an rpm, you have the advantage of fewer vibration problems when the repaired/re-machined shaft is extended. As above, torque and starting load and shock/start-stop stresses are going to determine method.

CS weld - assuming a good weld prep of sufficient size with a competent welder, the joint is straightforward.

RE: Shaft modification or manufactured new one

I am with dvd on this. How was the shaft made?
I presume that the center section is hollow?
Does the smaller shaft run full length? Or is it welded to the ends?
I would rather see you replace the entire stub end instead of splicing it.
If the smaller shaft runs full length them putting the splice inside of the shell would lessen the bending load on it.

RE: Shaft modification or manufactured new one

The problem with this piece is That I dont know how it is built. The smaller shaft go inside of the bigger but it is sealed, so I dont have a 100% information of how this is built and doesnt exist drawings of this.

Another problem is, if I do some modification in the shaft, this could affect the position of another equipment in the system.

I recommended to design and fabricated a new shaft and the new shaft will be with a hollow section and two smaller shaft at the ends to fit with the bearings. The shaft that we have in stock can be used like spare part for other system where this shaft can fit perfectly.

Thanks by your help and recommendations.

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